正确答案: A
边缘胎座
题目:一室的单子房,胚珠沿心皮的腹缝线成纵行排列,为( )。
解析:A
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举一反三的答案和解析:
[单选题]This printer is of good quality. If it ( )break down within the first year, we would repair it at our expense.
should
[单选题]The church tower which_________ will be open to tourists soon. The work is almost finished.
is being restored
解析:Restore意思为修复,而最后一句表明工程还未完成,因此为正在修复中,答案选D.
[单选题]用浓硫酸处理苋属植物种子可打破休眠,是因为该种子休眠的原因是( )。
种皮过于坚硬
[单选题]安徽章城所产著名的中国画纸张——“宣纸”的原料是( )的茎皮纤维。
青檀